Google MapsThe site of the Middlesex County jail in North Brunswick, where a 22-year-old prisoner hanged himself in an apparent suicide. The man was being held on charges of drug possession.

NORTH BRUNSWICK — A prisoner at the Middlesex County jail died at a hospital, officials said today, one day after he was found hanging in cell.

Middlesex County Administrator John Pulomena said officials were notified late this afternoon that the 22-year-old man had died.

"At this point it's under investigation," Pulomena said.

Authorities have yet to identify the man, who was brought the county jail in North Brunswick on drug charges.

Jail guards found the man hanging in a cell in the North Brunswick facility at 4:28 p.m. Monday, officials said. They said the man was taken to Robert Wood Johnson University Hospital in New Brunswick, where he was later pronounced dead.

North Brunswick police brought the man to the jail at 3:27 a.m. Friday after arresting him on charges of drug possession.